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Compound calcium borate, calcium borate optical crystal, preparation method of calcium borate optical crystal, and uses of calcium borate optical crystal

A technology of optical crystals and compounds, applied in chemical instruments and methods, boron oxide compounds, borates, etc., can solve the problems of no synthesis and crystal growth, no crystal birefringence properties, etc., and achieves difficult deliquescence and easy cutting. Effect

Inactive Publication Date: 2015-07-15
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no report on the synthesis and crystal growth of this compound, let alone the report on crystal birefringence and its application in optical devices.

Method used

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  • Compound calcium borate, calcium borate optical crystal, preparation method of calcium borate optical crystal, and uses of calcium borate optical crystal
  • Compound calcium borate, calcium borate optical crystal, preparation method of calcium borate optical crystal, and uses of calcium borate optical crystal
  • Compound calcium borate, calcium borate optical crystal, preparation method of calcium borate optical crystal, and uses of calcium borate optical crystal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] According to the chemical reaction formula 2CaO+2H 3 BO 3 → Ca 2 B 2 o 5 +3H 2 O ↑ synthesis of Ca 2 B 2 o 5 compound;

[0032] Synthesized by solid phase reaction method, CaO and H 3 BO 3 Put it into a mortar with a molar ratio of 1:1, mix and grind thoroughly, then put it into a Φ300mm×300mm corundum crucible, press it tightly, put it into a muffle furnace, slowly raise the temperature to 500°C, and keep the temperature for 24 hours After cooling to room temperature, take out the crucible. At this time, the sample is relatively hard. Take out the sample and grind it evenly, and then put it in the crucible. Keep the temperature in the Furnace at 850°C for 30 hours, then take it out and re-grind the sample evenly, then place it in a crucible, slowly raise the temperature to 1100°C, and keep the temperature constant for 70 hours. After cooling to room temperature, take out the crucible. Pound and grind in a mortar to obtain calcium borate compound, carry out X...

Embodiment 2

[0034] Growth of Ca by flux method 2 B 2 o 5 Crystal:

[0035] a. Mole ratio CaO:B 2 o 3 :LiF:PbO=1:3.5:2:9 Put it into a mortar for mixing and grinding, put it into a Φ50mm×40mm platinum crucible, heat to a temperature of 780°C, and keep the temperature for 30 hours to obtain a mixed melt;

[0036] b. Cool down the mixed melt obtained in step a to 680°C at a rate of 10°C / h, then slowly cool down to room temperature at a rate of 3°C / h, and crystallize to obtain seed crystals;

[0037] c. Growing crystals on the surface of the compound melt or in the melt: cool down the mixed melt obtained in step a to 660°C at a rate of 10°C / h, fix the seed crystal in step b on the seed rod, and lower it from the top The seed crystal is in contact with the surface of the mixed melt, the seed crystal is rotated at a speed of 40r / min, and the crystal is grown under the condition of cooling at a rate of 0.5°C / h;

[0038] d. After the single crystal grows to the desired size, the crystal is ...

Embodiment 3

[0040] Growth of Ca by flux method 2 B 2 o 5 Crystal:

[0041] a. Dilute CaCO in molar ratio 3 :H 3 BO 3 : Li 2 O:PbO=2:7:1:8 was mixed and ground in a mortar, put into a Φ60mm×50mm platinum crucible, heated to a temperature of 800°C, and kept at a constant temperature for 20 hours to obtain a mixed melt;

[0042] b. Cool the obtained mixed melt down to 670°C at a rate of 10°C / h, then slowly cool down to room temperature at a rate of 3°C / h, and crystallize to obtain seed crystals;

[0043] c. Growing crystals on the surface of the compound melt or in the melt: cool the mixed melt obtained in step a to 670°C at a rate of 10°C / h, fix the seed crystal in step b on the seed rod, and lower it from the top Put the seed crystal into the mixed melt, rotate the seed crystal at a speed of 10r / min, and grow the crystal at a rate of 0.2°C / h;

[0044] d. After the single crystal grows to the required size, the crystal is pulled up at a speed of 1.5mm / h, the seed crystal is lifted f...

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Abstract

The present invention relates to a compound calcium borate, a calcium borate optical crystal, a preparation method of the calcium borate optical crystal, and uses of the calcium borate optical crystal. According to the present invention, the chemical formula of the compound is Ca2B2O5, the molecular weight is 181.78, the space group is P2[1] / c, the crystal cell parameters comprise that a is 3.5582(5)angstrom, b is 6.3503(8)angstrom, c is 19.299(3)angstrom, beta is 92.386 DEG, V is 435.70(10)angstrom<3>, and Z is 4, and the solid state reaction method is used to synthesize; the chemical formula of the calcium borate optical crystal is Ca2B2O5, the calcium borate optical crystal belongs to the monoclinic system, the space group is P2[1] / c, the crystal cell parameters comprise that a is 3.5582 (5)angstrom, b is 6.3503(8)angstrom, c is 19.299(3)angstrom, beta is 92.386 DEG, V is 435.70(10)angstrom<3>, and Z is 4; the transmission range of the calcium borate optical crystal is 180-3000 nm, the birefringence is moderate, and the crystal has characteristics of easy cutting, polishing and preserve, stability in air, deliquescence resistance, and insolubility in water; and the calcium borate optical crystal can be used for producing polarizing prisms, phase delay devices, electro-optical modulators or beam splitting polarizers and other devices, wherein the devices utilize the refractive index characteristic of the crystal, and the important applications are provided in the fields of optics and communication.

Description

technical field [0001] The present invention relates to the chemical formula Ca 2 B 2 o 5 The compound calcium borate and the calcium borate optical crystal, the preparation method and the optical device made by using the crystal. Background technique [0002] Birefringence is one of the important characteristics of light propagating in anisotropic media. When light propagates in an optically heterogeneous medium, except for the direction of the optical axis, its vibration characteristics will be changed, and it will be decomposed into two beams of polarized light whose vibration directions of electric field vectors are perpendicular to each other, different propagation speeds, and different refractive indices. The phenomenon is called birefringence, and such crystals are called birefringent crystals. Among the two beams of light, the one that obeys the law of refraction is called ordinary light, and its refractive index is expressed by n o Indicates that a beam of ligh...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B15/00C01B35/12
CPCC30B15/00C30B29/22
Inventor 潘世烈刘璐张方方张芳袁
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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